Oscillating gradient spin echo

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August undefined, 2024

WebMay 7, 2024 · To overcome this problem, the oscillating-gradient spin-echo (OGSE) sequence has been developed to probe much shorter diffusion times using rapidly … WebThis study proposes a 3D oscillating gradient–prepared gradient spin-echo (OGprep-GRASE) sequence to improve SNR and shorten acquisition time for OG dMRI on clinical scanners. Methods: The 3D OGprep-GRASE sequence consisted of global saturation, diffusion encoding, fat saturation, and GRASE readout modules.

Oscillating-gradient spin-echo diffusion-weighted imaging (OGSE …

WebNov 29, 2012 · Oscillating gradient spin-echo (OGSE) sequences [13–15] , are sensitive to diffusion on the time scale of the oscillation period rather than the interval between WebMay 10, 2012 · Oscillating gradient spin-echo (OGSE) pulse sequences have been proposed for acquiring diffusion data with very short diffusion times, which probe tissue structure at the subcellular scale. OGSE sequences are an alternative to pulsed gradient spin echo measurements, which typically probe longer diffusion times due to gradient … bricco w hartford

Investigation of time-dependent diffusion in extra-axial brain …

WebFeb 1, 2024 · To overcome this, the oscillating gradient spin echo (OGSE) sequence has been developed to probe much shorter diffusion times with hardware limitations on … WebMay 1, 2024 · The oscillating-gradient spin-echo (OGSE) sequence has been promoted as a promising diffusion-weighted magnetic resonance imaging (DWI) technique for probing in vivo tissue microstructure. The method was first outlined by Stepisnik [1], but it wasn’t until many years later that in vivo applications began [2], [3]. WebFeb 1, 2024 · Oscillating gradient spin-echo (OGSE) sequences provide access to short diffusion times and may provide insight into micro-scale internal structures of pathologic … covercraft dealer portal

Diffusion dispersion imaging: Mapping oscillating …

Gaussian phase distribution approximations for …

WebOscillating gradient spin-echo (OGSE) sequences have demonstrated an ability to probe time-dependent microstructural features, although they often suffer from low SNR due to increased TEs. In this work we introduce frequency-tuned bipolar (FTB) gradients as a variation of oscillating gradients with reduced TE and demonstrate their utility by ... WebNov 15, 2024 · The oscillating gradient spin echo (OGSE) sequence (Does et al., 2003, Callaghan and Stepianik, 1995) was introduced to reach short diffusion times. An OGSE sequence usually consists of two oscillating pulses of duration T , each containing n periods, hence the frequency is ω = n 2 π T , separated by a time interval τ − T . covercraft carhartt seatsaver seat protectorsWebThe oscillating gradient spin-echo (OGSE) method ena-bles reduced D eff by using a succession of short diffusion weighting periods (15–17). The use of bipolar gradient … briceag browning

"WebA method of gradient moment nulling that correctly compensates both spin echo and stimulated echo components has been developed. The simplest solution involves nulling … " - Oscillating gradient spin echo

Oscillating gradient spin echo

Investigation of time-dependent diffusion in extra-axial brain …

WebDec 14, 2024 · Oscillating-gradient spin-echo sequences enable the measurement of diffusion weighting with a short diffusion time and can provide indications of internal structures and suggest restricted diffusion due to the structure within the lesions. Expand. 1. PDF. Save. Alert. WebTime-dependent Diffusion in Extra-Axial Brain Tumors Investigated with Oscillating-gradient Spin-echo. Tomoko Maekawa 1, Masaaki Hori 1,2, Katsutoshi Murata 3, …

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WebOscillating gradient (OG) enables the access of short diffusion times for time-dependent diffusion MRI (dMRI); however, it poses several technical challenges for clinical use. This … WebThe individual 64 MHz oscillations are too fast to resolve on this time scale. Although it is convenient to think about an FID arising from the action of a 90° pulse, an FID will be created by an RF pulse of any flip angle …

Websimultaneous high gradient amplitude and slew rate at 3.0T (MAGNUS) for brain microstructure imaging. Magnetic Resonance in Medicine 2024;n/a(n/a). 7. Arbabi A, Kai … WebFeb 15, 2024 · The pulsed gradient spin echo (PGSE) scans show localized areas of signal voids (white arrow) originating by spin dephasing during muscle activation. Note the bright signal from blood vessels in the diffusion-weighted scans obtained with oscillating gradient spin echo (OGSE), indicating motion compensation.

WebOscillating gradient spin-echo (OGSE) pulse sequences have been proposed for acquiring diffusion data with very short diffusion times, which probe tissue structure at the subcellular scale. OGSE sequences are an alternative to pulsed gradient (PGSE) measurements, which typically probe longer diffusion times due to gradient limitations. ... WebAug 28, 2014 · Pulsed gradient spin echo (PGSE) and oscillating gradient spin echo (OGSE) dMRI of the adult mouse brain was performed in vivo (50–200 Hz, b = 600 mm 2 /s), and a similar protocol was applied to neonatal mouse brains at 24 h after unilateral hypoxia-ischemia. Animals were perfusion fixed with 4% paraformaldehyde for ex vivo …

WebValidation of surface-to-volume ratio measurements derived from oscillating gradient spin echo on a clinical scanner using anisotropic fiber phantoms by Gregory Lemberskiy, Steven H. Baete, Martijn A. Cloos, Dmitry S. Novikov & Els Fieremans. April 2015 Mapping human brain capillary water lifetime: high‐resolution metabolic neuroimaging

WebNov 1, 2014 · Oscillating-gradient spin-echo sequences enable the measurement of diffusion weighting with a short diffusion time and can provide indications of internal structures. We report two cases of brain ... bricc tondoWebMay 16, 2011 · The oscillating gradient spin echo tensor images demonstrated frequency-dependent changes in diffusion measurements, including apparent diffusion coefficient and fractional anisotropy, in major brain structures. Maps of the rate of change in apparent diffusion coefficient with oscillating gradient frequency revealed novel tissue contrast in … bricco weinWebApr 11, 2024 · A recent study demonstrated that in small-scale prepolarized surface nuclear magnetic resonance (SNMR-PP) measurements with a footprint of a few squar… briceag buckWebJul 1, 2024 · This study proposes a 3D oscillating gradient–prepared gradient spin‐echo (OGprep‐GRASE) sequence to improve SNR and shorten acquisition time for OG dMRI on clinical scanners. Methods The... briceag cricketWebNov 1, 2024 · To achieve higher sensitivity to cellular and axonal size in the presence of orientation dispersion, oscillating gradient spin echo (OGSE) sequences will be explored for in vivo human imaging. OGSE can achieve short effective diffusion times ∼1 ms due to the inverse relationship of diffusion time with gradient oscillation frequency ( Does et ... briceag ieftinWebFat–water separation in a single acquisition was performed using both multi-echo fast spin echo and GRASE as compared to conventional multiacquisition fast spin echo with echo shifts. Results: The proposed single-slab 3D GRASE shows superior performance in accurately delineating cartilage structures compared to its counterpart, multi-echo 3D ... covercraft flannel car coversWebJan 28, 2024 · To demonstrate this, we used MRH to test whether cellularity in the mouse brain can be inferred from diffusion MRI signals, as our previous studies suggest that oscillating gradient spin echo (OGSE) (Does et al., 2003) diffusion MRI can generate a contrast similar to Nissl staining in both normal and injured mouse brains (Aggarwal et … covercraft endura